: Does that mean making a U-shape out of the metal bar, put it against the wall and around the top of the radiator and put a large screw fron the front of the radiator to the wall?

++ I had though of using a 1-inch 1/4" lag screw at the wall; but that's an alternative. There are lag screws used as wall bolts that can be connected to a threaded rod and coupling that could do as you propose.